[PATCH v11 8/9] fixup: Reset SO_PEEK_OFF value after incoming migration

[Stefano Brivio <sbrivio@redhat.com>]

From: David Gibson <david@gibson.dropbear.id.au>

TCP code needs to do different things depending on whether SO_PEEK_OFF
is enabled on the socket, and it assumes it is already set if it is
supported.  However, we didn't re-enable it on sockets created for an
incoming migration.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 tcp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tcp.c b/tcp.c
index f0d4a96..0f05011 100644
--- a/tcp.c
+++ b/tcp.c
@@ -3093,6 +3093,7 @@ int tcp_flow_migrate_target_ext(struct ctx *c, union flow *flow, int fd)
 {
 	struct tcp_tap_conn *conn = &flow->tcp;
 	struct tcp_tap_transfer_ext t;
+	uint32_t peek_offset;
 	int s = conn->sock;
 
 	if (read_all_buf(fd, &t, sizeof(t)))
@@ -3121,5 +3122,9 @@ int tcp_flow_migrate_target_ext(struct ctx *c, union flow *flow, int fd)
 
 	tcp_flow_repair_off(c, conn);
 
+	peek_offset = conn->seq_to_tap - conn->seq_ack_from_tap;
+	if (tcp_set_peek_offset(conn->sock, peek_offset))
+		tcp_rst(c, conn);
+
 	return 0;
 }
-- 
@@ -3093,6 +3093,7 @@ int tcp_flow_migrate_target_ext(struct ctx *c, union flow *flow, int fd)
 {
 	struct tcp_tap_conn *conn = &flow->tcp;
 	struct tcp_tap_transfer_ext t;
+	uint32_t peek_offset;
 	int s = conn->sock;
 
 	if (read_all_buf(fd, &t, sizeof(t)))
@@ -3121,5 +3122,9 @@ int tcp_flow_migrate_target_ext(struct ctx *c, union flow *flow, int fd)
 
 	tcp_flow_repair_off(c, conn);
 
+	peek_offset = conn->seq_to_tap - conn->seq_ack_from_tap;
+	if (tcp_set_peek_offset(conn->sock, peek_offset))
+		tcp_rst(c, conn);
+
 	return 0;
 }
-- 
2.43.0